What should you do when something you believe turns out to be wrong?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Why does bubbling occur when vinegar mixed with baking soda

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different